CN220452113U - Bearing assembly, variable pitch system and wind generating set - Google Patents

Abstract

This application discloses a bearing assembly, a pitch system and a wind turbine generator set. The bearing assembly includes a first bearing, a second bearing body, an outer connecting sleeve and an inner connecting sleeve. The outer connecting sleeve is sleeved on the inner connecting sleeve. On the outside, one end of the inner connecting sleeve is connected to the inner ring of the first bearing, the other end of the inner connecting sleeve is connected to the inner ring of the second bearing, and one end of the outer connecting sleeve is connected to the first bearing. The outer ring of the bearing, and the other end of the outer connecting sleeve is connected to the outer ring of the second bearing. This application can improve the load-bearing capacity of the bearing assembly.

Description

Bearing assembly, pitch system and wind turbine generator set

Technical field

The utility model relates to the technical field of wind power equipment, and specifically relates to a bearing assembly, a pitch system and a wind power generator set.

Background technique

As shown in Figure 1, Figure 1 is a partial schematic diagram of a pitch system.

The pitch system includes a hub 01 and a blade 02 . The hub 01 is fixed on the nacelle of the wind turbine generator. The blades 02 and the hub 01 are rotationally connected through a pitch bearing 03 . The pitch bearing 03 serves as a supporting structure to transmit the load of the blade 02 to the hub 01, and generates relative rotation between the blade 02 and the hub 01, thereby realizing the pitch action of the blade 02.

However, in this way that the pitch bearing 03 connects the blade 02 and the hub 01, the pitch bearing 03 carries a certain limit on the bending moment generated by the blade 02. When the load continues to increase, the pitch bearing 03 cannot meet the load-bearing requirements. It is necessary to adjust to increase the radial size of the pitch bearing 03 to increase the load-bearing capacity. This will increase the overall size of the wind turbine on the one hand. On the other hand, the structural size of the pitch bearing 03 has certain limitations. If the load-bearing capacity is obvious If the increase exceeds the structural size range of the pitch bearing 03, it will be impossible to continue to increase the bearing capacity.

Utility model content

The purpose of this application is to provide a bearing assembly, a pitch system and a wind turbine generator set that can improve the bearing capacity.

The present application provides a bearing assembly. The bearing assembly includes a first bearing, a second bearing body, an outer connecting sleeve and an inner connecting sleeve. The outer connecting sleeve is sleeved on the outside of the inner connecting sleeve. The inner connecting sleeve One end of the outer connecting sleeve is connected to the inner ring of the first bearing, the other end of the inner connecting sleeve is connected to the inner ring of the second bearing, and one end of the outer connecting sleeve is connected to the outer ring of the first bearing. The other end of the connecting sleeve is connected to the outer ring of the second bearing.

In a specific implementation, the first bearing and the second bearing are both sliding bearings or rolling bearings; or among the first bearing and the second bearing, one is a sliding bearing and the other is a sliding bearing. The ones are rolling bearings.

In a specific implementation, the inner connecting sleeve and the outer connecting sleeve are connected with the first bearing and the second bearing through fasteners, press-fit connection, welding or integral arrangement.

In a specific implementation, the radial dimensions of the first bearing and the second bearing are equal.

This application also provides a pitch changing system, including a hub, blades, and any of the above bearing components, the first bearing is connected to the hub, the blades and the second bearing, or the The inner connecting sleeve, the outer connecting sleeve, or the first bearing are connected to rotate relative to the hub.

In a specific implementation, the blade is connected to the inner ring or outer ring of the second bearing.

In a specific embodiment, the root of the blade has an annular connecting end, and the connecting end is press-fit connected to the inner ring or outer ring of the second bearing; or, the blade is connected to the second bearing by a press fit. The inner ring or outer ring of the second bearing is connected through fasteners; or the blade is welded to the inner ring or outer ring of the second bearing.

The outer ring of the first bearing is connected to the hub, and the blade is connected to the inner ring of the second bearing.

This application also provides a wind turbine generator set, including the pitch variable system described in any one of the above.

The bearing assembly in this application is provided with an inner connecting sleeve and an outer connecting sleeve to connect the first bearing and the second bearing. This is equivalent to extending the bearing, which can generate higher resistance to bending moments and improve the load-bearing capacity of the pitch system. , and the radial size of a single first bearing and second bearing does not need to be increased. In terms of the whole machine, the size can be more effectively controlled to achieve weight reduction. Moreover, when the size of large-capacity units continues to increase, Under this method, the pressure on transportation in terms of engineering realization is reduced, and the transportation capacity can be met, making it possible to develop larger-sized units.

Description of drawings

Figure 1 is a partial schematic diagram of a pitch system;

Figure 2 is a schematic diagram of the pitch system in the embodiment of the present application;

Figure 3 is a schematic diagram of the bearing assembly in Figure 2;

Figure 4 is a force analysis diagram of the pitch system in Figure 2.

The reference symbols in Figures 1-4 are explained as follows:

01-hub; 02-blade; 03-pitch bearing;

100-hub; 200-blade; 201-connecting end; 300-bearing assembly; 301-first bearing; 302-second bearing; 303-connecting section; 3031-outer connecting sleeve; 3032-inner connecting sleeve.

Detailed ways

In order to enable those skilled in the art to better understand the solution of the present utility model, the present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Please refer to Figure 2 for understanding. Figure 2 is a schematic diagram of the pitch system in the embodiment of the present application.

The pitch system in this embodiment includes a hub 100, blades 200 and a bearing assembly 300. The hub 100 can be fixedly installed in the nacelle of the wind turbine generator (not shown in the figure), where the blades 200 and the hub 100 are rotationally connected. The system may include multiple blades 200 , for example, three blades 200 . The multiple blades 200 are all installed on the hub 100 . The hub 100 may transmit wind power to the main shaft of the generator in the nacelle to convert wind energy into electrical energy.

It is worth noting that the blade 200 in this embodiment is rotationally connected through the bearing assembly 300 and the hub 100 .

As shown in FIG. 3 , FIG. 3 is a schematic diagram of the bearing assembly 300 in FIG. 2 .

The bearing assembly 300 in this embodiment includes a first bearing 301, a second bearing 302, an outer connecting sleeve 3031 and an inner connecting sleeve 3032. The outer connecting sleeve 3031 is set on the outside of the inner connecting sleeve 3032, that is, the inner connecting sleeve 3032 is located outside. Inside the connecting sleeve 3031, the outer connecting sleeve 3031 and the inner connecting sleeve 3032 form a double-layer connecting section 303. The first bearing 301, the second bearing 302, the outer connecting sleeve 3031 and the inner connecting sleeve 3032 are coaxially arranged. Among them, one end of the inner connecting sleeve 3032 is connected to the inner ring of the first bearing 301, the other end of the inner connecting sleeve 3032 is connected to the inner ring of the second bearing 302, one end of the outer connecting sleeve 3031 is connected to the outer ring of the first bearing 301, and the outer connecting sleeve 3032 is connected to the inner ring of the first bearing 301. The other end of the sleeve 3031 is connected to the outer ring of the second bearing 302 . In this way, as shown in Figure 3, the inner ring of the first bearing 301, the inner connecting sleeve 3032, and the inner ring of the second bearing 302 are connected in sequence along the axial direction to form a cylindrical structure. The outer rings of the connecting sleeve 3031 and the second bearing 302 are connected in sequence along the axial direction to form another cylindrical structure. In this way, the first bearing 301, the second bearing 302 and a connecting joint 303 are combined to form an elongated elongated structure. bearings.

At this time, look at Figure 4 again. Figure 4 is a stress analysis diagram of the pitch system in Figure 2.

In this embodiment, the first bearing 301 of the bearing assembly 300 is connected to the hub 100, and the first bearing 301 is connected to the second bearing 302 through the connecting joint 303, then the second bearing 302 and the hub 100 are also connected. For example, the first bearing 301 is connected to the hub 100. The outer ring of the bearing 301 is fixedly connected to the hub 100, and the outer ring of the second bearing 302 is also indirectly fixedly connected to the hub 100 through the connection with the outer connecting sleeve 3031. Please refer to Figure 4 at this time. The force-bearing position where the blade 200 forms a bending moment M on the bearing assembly 300 is the O position, which is the position of the second bearing 302, and the force-bearing position where the resisting bending moment is generated is at the P position, which is the first position. For the position of the bearing 301, the O position can be understood as the support position. One side is the bending moment generated by the blade 200, and the other side is the resisting bending moment. The moment arm resisting the bending moment is L, which is roughly the axis of the connecting node 303. In the direction of length, the longer the length of the connecting section 303, the longer the moment arm L that resists the bending moment.

It can be seen that the bearing assembly 300 in this embodiment, due to the extension of the connecting section 303, can generate higher resistance to bending moments and improve the load-bearing capacity of the pitch system, while the single first bearing 301 and the second bearing 302 The radial size does not need to be increased. In terms of the whole machine, the size can be more effectively controlled to achieve weight reduction. Moreover, as the size of large-capacity units continues to increase, the pressure on transportation in terms of engineering implementation is reduced. , can meet the transportation capacity. At present, the blade root size of the blade 200 of the wind turbine has reached 3.6m. In this way, the entire wind turbine has reached the transportation limit, and it is impossible to continue to develop larger wind turbines. Due to the Set up in such a way that the size of the wind turbine can be controlled, making the development of larger size units possible.

It can be seen that the inner connecting sleeve 3032 and the outer connecting sleeve 3031 in this embodiment are mainly used to connect the first bearing 301 and the second bearing 302. They are cylindrical structures with two axial ends open, but for the inner connection As for the sleeve 3032, its axial ends are not limited to being open. It can also have end covers or both axial ends have extensions extending inward, as long as it does not affect the nested installation with the outer connecting sleeve 3031. That is, in fact, the end cap or extension can also be connected to the blade 200 . In addition, the inner connecting sleeve 3032 and the outer connecting sleeve 3031 have a radial distance so as not to interfere with their relative rotation.

It should be noted that the first bearing 301 and the second bearing 302 in this embodiment can be set to have equal radial dimensions. In this case, the outer connecting sleeve 3031 and the inner connecting sleeve 3032 are also of equal diameter structure, so that the hub 100 can be maintained While the index circle connected to the blade 200 remains unchanged, the resistance to bending moment is increased. Of course, the equality here does not require absolute equality, and a certain deviation is also acceptable.

Please continue to refer to Figure 3. In this embodiment, the inner connecting sleeve 3032 and the outer connecting sleeve 3031 can be connected to the first bearing 301 and the second bearing 302 through fasteners, press-fit connection or welding. For example, the first bearing 301 and the second bearing 302 can be standard parts, generally equipped with axial mounting holes. The inner connecting sleeve 3032 and the outer connecting sleeve 3031 can be connected to the corresponding bearings through fasteners such as bolts inserted into the mounting holes. connect. Of course, the inner connecting sleeve 3032, the outer connecting sleeve 3031 and the corresponding bearings can also be press-fitted. For example, the inner connecting sleeve 3032 is press-fitted with the inner rings of the first bearing 301 and the second bearing 302, and the outer connecting sleeve 3031 is press-fitted with the first bearing. The outer rings of the bearing 301 and the second bearing 302 are press-fitted. It is also possible that the inner connecting sleeve 3032 and the outer connecting sleeve 3031 are connected by welding to the corresponding bearings. The above are all feasible connection methods and are not specifically limited in this embodiment.

It can also be understood that the connecting joint 303 and the first bearing 301 and the second bearing 302 can also be provided integrally. For example, the inner connecting sleeve 3032 is integrally provided with the inner rings of the first bearing 301 and the second bearing 302, and the outer connecting sleeve 3031 is integrally provided with the first bearing 301 and the second bearing 302. The outer rings of the bearing 301 and the second bearing 302 are integrally arranged. Of course, considering the processing cost, the aforementioned separate connection method is more conducive to effective cost control.

In addition, as mentioned above, the inner connecting sleeve 3032 and the outer connecting sleeve 3031 form the connecting joint 303 for connecting the first bearing 301 and the second bearing 302, which is equivalent to lengthening the first bearing 301, then the inner connecting sleeve 3032 and the outer connecting sleeve 3032 The connecting sleeve 3031 can be made of the same material as the first bearing 301 and the second bearing 302. For example, both can be made of steel. Of course, it can also be made of other materials that meet the load-bearing requirements.

As an option, the first bearing 301 and the second bearing 302 in this embodiment may both be sliding bearings or both rolling bearings, and the rolling bearings may be, for example, ball bearings or column bearings. Sliding bearings are bearings that work under sliding friction. Sliding bearings have the advantages of smooth operation, reliability, and low noise. Rolling bearings are bearings that work under rolling friction. Relatively speaking, sliding bearings work more smoothly.

It can be seen that among the first bearing 301 and the second bearing 302, one may be a sliding bearing and the other may be a rolling bearing. That is, the first bearing 301 and the second bearing 302 may be different bearings, forming different bearing combinations. , can be selected according to actual needs to give full play to the advantages of different bearings.

This embodiment also provides a pitch changing system, including a hub 100, blades 200, and the bearing assembly 300 described in any of the above embodiments. The pitch changing system obviously has the same technical effects as the above embodiments, and will not be described again.

In this embodiment, as shown in Figure 2, the first bearing 301 is connected to the hub 100, and its outer ring is fixedly connected to the hub 100. As mentioned above, the outer ring can be provided with mounting holes, and some of the mounting holes are used for fastening with bolts. To the hub 100, part of the mounting holes are used to connect with the outer connecting sleeve 3031 through bolts. At this time, the inner ring of the second bearing 302 is connected to the blade 200. The blade 200 can be provided with an annular connecting end 201, and the connecting end 201 can be press-fitted to the hub 100. The inner ring of the second bearing 302, so that the blade 200 can rotate with the inner ring of the second bearing 302. It can be seen that the inner ring of the first bearing 301 is fixedly connected to the hub 100, and the outer ring of the first bearing 301, the outer connecting sleeve 3031, and the outer ring of the second bearing 302 can also be rotating parts. In this case, the blade 200 can be connected with the second bearing 300. The outer ring of bearing 302 is fixed. The connection method between the blade 200 and the second bearing 302 is not limited to the press fit shown in Figure 2. It can also be connected and fixed to the second bearing 302 through fasteners. For example, the inner ring or outer ring of the second bearing 302 is provided with mounting holes, the blades 200 are connected and fixed by inserting bolts into the mounting holes of the second bearing 302,

Alternatively, the blade 200 and the inner ring or outer ring of the second bearing 302 are welded and fixed.

In addition, it can be understood that the blade 200 can actually be connected to the connecting node 303, that is, connected to the inner connecting sleeve 3032 or the outer connecting sleeve 3031, or can also be connected to the inner ring or the outer ring of the first bearing 301, but from the figure 4, the supporting position of the bearing assembly 300 is the position of the second bearing 302, and the space between the second bearing 302 and the first bearing 301 is used to generate a resisting bending moment. Therefore, if the blade 200 is connected to the connecting joint 303 or is the first bearing 301, then the part of the blade 200 between the second bearing 302 and the hub 100 actually has functional overlap with the bearing assembly 300. Therefore, as an option, as shown in Figure 2, the blade 200 is connected to the second bearing assembly 300. Just connect the bearing 302.

This embodiment also provides a wind power generator, including the pitch variable system described in any of the above embodiments. The wind power generator has the same technical effects as those in the above embodiments, which will not be described again.

This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core idea of this application. It should be noted that for those of ordinary skill in the art, several improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims (9)

1. The bearing assembly is characterized by comprising a first bearing, a second bearing body, an outer connecting sleeve and an inner connecting sleeve, wherein the outer connecting sleeve is arranged on the outer side of the inner connecting sleeve, one end of the inner connecting sleeve is connected with the inner ring of the first bearing, the other end of the inner connecting sleeve is connected with the inner ring of the second bearing, one end of the outer connecting sleeve is connected with the outer ring of the first bearing, and the other end of the outer connecting sleeve is connected with the outer ring of the second bearing.

2. The bearing assembly of claim 1, wherein the first bearing and the second bearing are both plain bearings or both rolling bearings; or one of the first bearing and the second bearing is a sliding bearing, and the other is a rolling bearing.

3. Bearing assembly according to claim 1, wherein the inner and outer connection sleeves are connected or press-fit connected or welded or integrally provided with the first and second bearings by means of fasteners.

4. A bearing assembly according to any one of claims 1 to 3, wherein the radial dimensions of the first bearing and the second bearing are equal.

5. A pitch system comprising a hub, a blade, and the bearing assembly of any of claims 1-4, the first bearing being coupled to the hub, the blade and the second bearing, or the inner sleeve, or the outer sleeve, or the first bearing being coupled for rotation relative to the hub.

6. A pitch system as defined in claim 5, wherein the blades are coupled to an inner or outer ring of the second bearing.

7. The pitch system of claim 5, wherein the root of the blade has an annular connection end that is press fit with an inner or outer ring of the second bearing; or the blades are connected with the inner ring or the outer ring of the second bearing through fasteners; alternatively, the blades are welded to the inner or outer ring of the second bearing.

8. A pitch system according to any of claims 5-7, wherein the outer ring of the first bearing is connected to the hub and the blades are connected to the inner ring of the second bearing.

9. A wind power plant comprising a pitch system according to any of claims 5-8.